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Finding the Fourth Proportional to 326,879.12, 490,305.36 and 90,215.72

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Solution

The fourth proportional to 326,879.12, 490,305.36 and 90,215.72 is: 135,319.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,879.12 : 490,305.36 = 90,215.72 : x
  2. Step 2: Convert to fraction form
    326,879.12/490,305.36 = 90,215.72/x
  3. Step 3: Cross multiply
    326,879.12x = 490,305.36 × 90,215.72
  4. Step 4: Simplify right side
    326,879.12x = 44,233,251,072.26
  5. Step 5: Solve for x
    x = 44,233,251,072.26/326,879.12
  6. Step 6: Final answer
    x = 135,319.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.